The FAA does not allow it, neither does Canada and the ICAO standards do not allow it.
But as I said we are very liberal with this already, compared with ICAO and the rest of the world.
that quite a lot of these medical standards are not set by CASA.
I think we are in a situation where, to go even further, we would need more than a safety case. We would most probably need medical science to tell us that that is probably not too far.
When they wind in this advanced, modern, scientific, fully supported exception to ICAO, it will probably be the only part of ICAO for which as exemption has not been filed...More regulations and restrictions make for more safety – what a narrow, bureaucratic, black letter law, prehistoric approach.....
Even ICAO don't want to deal with this puppy; a sad, sorry state of affairs, when you consider what it costs to keep other ICAO compliant countries baffled; deciding if Australia is compliant in fact, rather than on paper. (refer Boyd - Hansard Maintenance).